Catalytic Carbon−Carbon Bond Activation and Functionalization by Nickel Complexes
作者:Brian L. Edelbach、Rene J. Lachicotte、William D. Jones
DOI:10.1021/om990387i
日期:1999.9.1
presence of excess biphenylene and excess alkyne results in very slow catalyticformation of the corresponding 9,10-disubstituted phenanthrene. However, addition of ∼6 mol % O2 (based on the metal complex) to the reaction mixture results in an acceleration in catalysis at lower temperatures (∼70−80 °C). The thermolysis of complexes 3 or 4 with excess biphenylene and excess alkyne leads to the alkyne
镍炔化合物(dippe)Ni(PhC⋮CPh),1,(dippe)Ni(MeC⋮CMe),2,(dippe)Ni(MeO 2 CC⋮CCO 2 Me),3,(dippe)Ni(CH合成了3 OCH 2 C⋮CCH 2 OCH 3)4和(dippe)Ni(CF 3 C⋮CCF 3)5(dippe =双(二异丙基膦基)乙烷),并用1 H,31 P和1 H表征。13 C 1 H} NMR光谱。配合物1,2,和3用X射线晶体学表征。在过量的联苯和过量的炔烃存在下,配合物1或2(120°C)的热解反应会非常缓慢地催化形成相应的9,10-二取代的菲。但是,向反应混合物中添加约6 mol%O 2(基于金属络合物)会导致在较低温度(约70-80°C)下催化作用加快。配合物3或4与过量的联苯和过量的炔烃的热解导致炔烃环三聚产物作为反应中形成的主要有机物。通过加热(浸渍)Ni(CO)2催化生产芴酮也可以通过加热(浸渍)Ni(2
Synthesis of Low-Valent Nickel Complexes in Aqueous Media, Mechanistic Insights, and Selected Applications
作者:Illán Morales-Becerril、Marcos Flores-Álamo、Adrián Tlahuext-Aca、Alma Arévalo、Juventino J. García
DOI:10.1021/om500767p
日期:2014.12.8
The synthesis of nickel(0) complexes usually requires the employment of strong reducing agents, including powerful hydride donors such as LiHBEt3, LiAlH4, and DIBAL-H. Herein, we have reduced the Ni(II) complex [(dippe)NiCl2] (1a) at room temperature by using KOH in aqueous media to yield the low-valentcomplex [Ni(dippe)2] (4a) as the main product, along with the formation of dippeO2. In order to